Alist that provides specific details about what a food package contains is called:

The correct answer is- ingredient list

Explanation:

An ingredient list provides specific details about what is present in a food package. According to the FDA, all the food ingredients should be written in decreasing order of their weight present in packaged food.

This means that the ingredient that helps in making most of the product comes first which is followed by the next ingredient and so no. If any ingredient is made up of several ingredients then that is also included in the list below the main ingredient.  

If any preservative is added then its function is described in the list. So the correct answer is the ingredient list.